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Plant Uptake

Plant Uptake. Parent Material. Precipitated Forms. Igneous rocks,F Feldspar and Ferromagnesian, minerals, Sedimentary rocks. Fe 2 (MoO 4 ) 3. PbMoO 4. CaMoO 4. Animals. Plant Residue. Forage toxicity at > 5 ppm. Availability. Crop Removal. Man. Coal Combustion. Sewage Sludge. O.M.

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Plant Uptake

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  1. Plant Uptake Parent Material Precipitated Forms Igneous rocks,F Feldspar and Ferromagnesian, minerals, Sedimentary rocks Fe2(MoO4)3 PbMoO4 CaMoO4 Animals Plant Residue Forage toxicity at > 5 ppm Availability Crop Removal Man Coal Combustion Sewage Sludge O.M. Soil Solution Steel Industry Mining Weathering Mo Fertilizers Na2MoO4 Adsorption: (NH4)2Mo2O7 Fe and Al oxides at low pH MoO3 MoS2

  2. Plant Uptake Nitrate Reductase (NO3- to NO2-), Fixation of N2 by Nitrogenase MoO42- Mass Flow or Diffusion Soil Solution Dominant Species: MoO42-, HMoO4-, H2MoO4 pH>4:MoO42-, HMoO4- pH<4: H2MoO4, MoO22+ Parent Material Igneous rocks,F Feldspar and Ferromagnesian, minerals, Sedimentary rocks Animals Forage toxicity at > 5 ppm Crop Removal Man Coal Combustion Sewage Sludge Steel Industry Mining Weathering

  3. Plant Uptake Nitrate Reductase (NO3- to NO2-), Fixation of N2 by Nitrogenase Soil Solution Dominant Species: MoO42-, HMoO4-, H2MoO4 pH>4:MoO42-, HMoO4- pH<4: H2MoO4, MoO22+ Plant Residue MoO42- Mass Flow or Diffusion O.M. Mineralization Immobilization Mo Fertilizers Na2MoO4 (NH4)2Mo2O7 MoO3 MoS2

  4. Plant Uptake Nitrate Reductase (NO3- to NO2-), Fixation of N2 by Nitrogenase Soil Solution Dominant Species: MoO42-, HMoO4-, H2MoO4 pH>4:MoO42-, HMoO4- pH<4: H2MoO4, MoO22+ Precipitated Forms Fe2(MoO4)3 PbMoO4 CaMoO4 Dissolution Adsorption: Precipitation Fe and Al oxides at low pH

  5. Plant Uptake Nitrate Reductase (NO3- to NO2-), Fixation of N2 by Nitrogenase Soil Solution Dominant Species: MoO42-, HMoO4-, H2MoO4 pH>4:MoO42-, HMoO4- pH<4: H2MoO4, MoO22+ Availability MoO42- Mass flow or diffusion Increases with increasing pH and soil moisture

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